Centrifugal decanter and process



. faces 3. whilst running by mechanism which 1s fully need not be detailedhere.

includes a motor a thevalve 5 of which is Patented Jan. 9, 1923.

tilhttTE STATES 1.441.732 PATENT IFFH WILHELM MAUSS, JOHANNESBUBG, TRANSVAAL, SOUTH AFRICA, ASSIGNOR TO CONTINUOUS CENTRIFUGALS LIMITED, OF JOHANNESBUBG, TBANSVAAL PROV- Incn or THE Union or SOUTH AFRICA.

CENTRIFUGAL DECANTER AND PROCESS.-

Application filed March 23, 1921. Serial No. 454,953.

To all to 72pm it may concern 1 Be it known that WILHELM Manes, a British subject, residing at 7 2 Cullinan Buildings, Simmonds Street, Johannesburg, Transvaal Province of the Union of South Africa, has invented certain new and useful Improve ments in Centrifugal Decanters and Processes of which the following is a specification.

, The present invention has reference to centrifugal decantation apparatus and is illustrated in the accompanying drawing in which, i

F'g. Ishows a partly sectional view of ap paratus according to this invention, and

Fig. II is a plan of the timing apparatus.

Fig. III is a detailed sectional view of the timing barrel.

The invention relates more particularly to the invention described in my Patent No. M19285, granted June 13, 1922.

1 indicates a. rotating drum formed of a number of sections 2 separable at the sur- The drum is opened and closed described in my previous application and Said mechanism actuated periodically by a tumbling bob 6 which is thrown alternately back and forth by cleats 7 and 8 adjust-ably fixed on a slowly revolving barrel 9. This barrel is provided with a depending trunnion 9 which is swivcled in a bracket 9*. The barrel is connected to the trunnion by a web 9 and is driven by a worm gearing 9. T- shaped grooves 9 extend around the barrel and in each of these grooves (Fig. III) is mounted an adjustable jaw 9 held in position by a screw 9 The screws are provided with beads or cleats 7 8, 22, 23, 241. and 25. The drum provides number of V shaped separating chambers 10, 10 from which settled solid is discharged into receiver 11 when the drum sections 2 are parted. The material to be treated is fed by a pipe 12 into the drum at one end. and the clean liquid is decanted from the other end of the drum through outlets 13 into a receiver 14;. The solid matter deposits in the separating chambore 10, 1O successively from the feed. end to the other end of the drum. The separating operation is stopped however before the last separating chamber 10 is fully charged with solid in order to preclude solid matter from passing away with the liquid.

In my previous application I showed an additional receiver into which the contents of the last chamber 10* were discharged, separately from the contents of the chambers 10. Provision was made for inspecting such material and either returning the same for re-treatment or adding it to the discharge from the chambers 10 it it were sufiiciently separated.

According to the present invention after the supply of unseparated material to the decanter is stopped the contents of the chambers 10 and 10 are washed to displace the original liquid still remaining with the solid. The whole contents of the drum are then discharged into receiver 11 and provision is made for taking a sample of the discharge from the last chamber 10*. i

In the drawing 15 indicates a source 01 supply of sayv sugar juice, controlled by a valve 16, which discharges into the funnel mouth 17 of the feed pipe 12. 18 is a conduit for supplying wash water which also discharges into the funnel mouth 17 and is controlled by a valve 19. A tumbling bob 2O actuates the juice valve 16, whilst a second tumbling bob 21 actuates the valve 19. The tumbling bobs 6,20 and 21 are pivotally mounted on suitable supports 6. Clea-ts 22, 23, 24: and 25 fixed on the barrel 9 cause the operation of the parts in the following sequence.

The drum being revolving and closed, cleat 22 throws the tumbling bob 20 to open the valve 16 whereby impure juice is fed to the drum and separated therein. After av period calculated to enable the lower drum chambers 10 to fill with solid matter and the uppermost chamber 10 partially to fill therewith, the clea-t 23 throws over the tumbling bob 20 to close the valve 16 and at the same time the cleat 2 1 throws the tumblin bob 21 to open the wash water valve 19.

Wash water thereupon flows into the drum from the pipe 12 and displaces the residual sugar juice therefrom. After a sufficient lapse of time to complete such displacement the cleat 7 throws the tumbling bob 6 to actuate the valve 5 of the motor 4 to cause the latter to open the drum whereby the solid matter is discharged. The How of wash water continues, to assist the discharge of the solid matter, and is terminated by the cleat 25 throwing the tumbling bob 21 to close valve 19. Immediately thereafter the cleat 8 throws back the tumbling bobG to cause the drum to close, Whereafter the cycle is repeated.

The various steps enumerated are so timed as to give the greatest economic separat on.

of sugar juice from the solid matter. In

order to permit effective control of-.the timlong the separation period, Whilst if the sample indicates an excess ofrsolid matter, so that there is adanger of such matter passing off With the juice, said cleat 22 1s advanced. Similarly if underwashing or over- Washing is indicated, the Cheat 8 is set backwards or forwards accordingly.

I claim' 1. The process of centrifugal decantation which consists in centrifugally treating a batch of mixture to cause deposition of solid and decantation of liquid therefrom, fully separating the main. portion of the batch and partially separating the remaining portion'of the batch, discharging thedecanted liquid, displacing residual liquid from the solid by another liquid, a-nddis charging the solid. i

'2. The process of centrifugal decantation which consists in centrifugally treating a batch of mixture to cause deposition of solid and decantation of liquid therefrom, fully separating the main portion of the batch and partially separating the remaining portion of the batch, discharging the decanted liquid, displacing residual liquid from the solid by another liquid, discharging'and sampling the solid of the remaining portion and discharging the solid of the main portion.

3.-In a centrifugal decanter, a drum arranged for decantation treatment of mixture, means to feed alternatively mixture'and dis placement liquid to the drum,a liquid overflow remote from the feedingmeans, a set tlement chamber separate from the rest of the drum and next to the overflow, and

means to discharge material from the drum.

4. In a centrifugal decanter, a drum ar-;

ranged for decantation treatment of mixture, means to feed alternatively mixture anddisiplacement liquid to the drum, a liquid overflow remote from the feeding means,1a settlement chamber separate from the rest of the drum and next to the overflow, and a sampling device arranged to-receive material discharged from the settlement-chamber next to the overflow.

5. In a centrifugal decanter, a drum arranged for decantation treatmentof mixture, means to feed alternatively mixture and displacement liquid to the drum, a

liquid overflow remote from the feeding means, a settlement chamber separate from the rest of the drum and next .to the overflow, av casing forming a receiver for solid matter discharged from the drum, adoor in said casing and a pocket arranged ,on the inside of said door to receive material discharged fromfthefchamber next to the overflow.

In testimony whereof I afiix my signature.

' WILHELM MAUSS. 

